Radeon RX 6400 vs GeForce GTX 660 Rev. 2
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | not rated | 276 |
| Place by popularity | not in top-100 | 100 |
| Cost-effectiveness evaluation | no data | 53.37 |
| Power efficiency | no data | 25.69 |
| Architecture | Kepler (2012−2018) | RDNA 2.0 (2020−2024) |
| GPU code name | GK104 | Navi 24 |
| Market segment | Desktop | Desktop |
| Release date | 13 September 2014 (10 years ago) | 19 January 2022 (2 years ago) |
| Launch price (MSRP) | no data | $159 |
Cost-effectiveness evaluation
Performance to price ratio. The higher, the better.
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 960 | 768 |
| Core clock speed | 980 MHz | 1923 MHz |
| Boost clock speed | 1032 MHz | 2321 MHz |
| Number of transistors | 3,540 million | 5,400 million |
| Manufacturing process technology | 28 nm | 6 nm |
| Power consumption (TDP) | 140 Watt | 53 Watt |
| Texture fill rate | 82.56 | 111.4 |
| Floating-point processing power | 1.981 TFLOPS | 3.565 TFLOPS |
| ROPs | 24 | 32 |
| TMUs | 80 | 48 |
| Ray Tracing Cores | no data | 12 |
Form factor & compatibility
Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
| Interface | PCIe 3.0 x16 | PCIe 4.0 x4 |
| Length | 241 mm | no data |
| Width | 2-slot | 1-slot |
| Supplementary power connectors | 1x 6-pin | None |
VRAM capacity and type
Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.
| Memory type | GDDR5 | GDDR6 |
| Maximum RAM amount | 2 GB | 4 GB |
| Memory bus width | 192 Bit | 64 Bit |
| Memory clock speed | 1502 MHz | 2000 MHz |
| Memory bandwidth | 144.2 GB/s | 128.0 GB/s |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | 2x DVI, 1x HDMI, 1x DisplayPort | 1x HDMI 2.1, 1x DisplayPort 1.4a |
| HDMI | + | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 12 (11_0) | 12 Ultimate (12_2) |
| Shader Model | 5.1 | 6.7 |
| OpenGL | 4.6 | 4.6 |
| OpenCL | 1.2 | 2.2 |
| Vulkan | 1.1.126 | 1.3 |
| CUDA | 3.0 | - |
Pros & cons summary
| Recency | 13 September 2014 | 19 January 2022 |
| Maximum RAM amount | 2 GB | 4 GB |
| Chip lithography | 28 nm | 6 nm |
| Power consumption (TDP) | 140 Watt | 53 Watt |
RX 6400 has an age advantage of 7 years, a 100% higher maximum VRAM amount, a 366.7% more advanced lithography process, and 164.2% lower power consumption.
We couldn't decide between GeForce GTX 660 Rev. 2 and Radeon RX 6400. We've got no test results to judge.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
